<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="alipay/refund" method="get">
    订单号：<input name="out_trade_no" required/><br/>
    退款金额：<input name="refund_amount" required/><br/>
    <button>退款</button>
</form>
</body>
</html>